Katy Perry perform during the semi final show of 'The Voice Of Germany on December 13, 2013 in Berlin, Germany.
(December 12, 2013 - Source: Timur Emek/Getty Images Europe) see more angles »
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Katy Perry Mini Skirt

Katy Perry added a preppy touch with a red plaid mini skirt.

Katy Perry Crop Top

Katy Perry looked racy in a black mesh crop-top while performing on 'The Voice of Germany.'

Katy Perry Lace Up Boots

Black lace-up booties completed Katy Perry's attire.